Just curious about RTT/TTY calls.

Make or receive RTT/TTY phone calls

• Open the Phone app.
• Select your contact and tap their phone number.
• Select RTT/TTY or RTT/TTY Relay.
• Wait for the call to connect, then select RTT/TTY.
• Enter your message. If you turn on Send Immediately in Settings, your recipient sees your message as you type.

Answer or make RTT or TTY calls from your iPhone

Nightflyr wrote:

Could it have been initiated by a caller, with an android?

As I recall, Android phones have a similar feature. So, yes.

How long is the transcript stored?

iPhones store the last 100 calls in Recents. So, how long, time-wise, would depend on how many calls you make and receive on your phone.

For any Legal Eagles: Can it be used as evidence in a court of law?

That is a question you should ask a lawyer. Never take legal or medical advise from random strangers on the internet.